The tax rise that never went to a vote
No government stood up in Parliament and proposed raising taxes on middle-income earners by 1.65 percentage points. No select committee debated it. No minister defended it on morning radio. Yet that is precisely what happened. An Inland Revenue report briefed to Finance Minister Nicola Willis confirms that the average tax rate paid by New Zealanders is 1.65 percentage points higher than it would be if thresholds had kept pace with inflation since 2010. The mechanism is bracket creep, and it has quietly extracted the equivalent of 1 percent of GDP in additional revenue every year.
Tax expert Terry Baucher put it bluntly: “Fiscal drag has been the dirty little secret of the tax system.” Taxpayers’ Union head of communications Tory Relf called it “a tax hike by stealth.”
For business owners, this is not an abstract fairness debate. It is a direct cost, hitting both payroll and the spending power of their core customers.
$2 billion stripped from middle earners
The IRD analysis puts a hard number on the damage. Workers earning between $60,000 and $90,000 collectively paid an extra $2 billion in tax in 2024 compared with what they would have owed under fully indexed brackets. That cohort is not wealthy. It is teachers, tradies, mid-career professionals, and small business employees. It is also the core customer base for retail, hospitality, and professional services.
IRD wage and salary distribution data shows the drift in stark terms. The peak income band, where the largest number of earners cluster, shifted from $35,000 in 2002 to $70,000 in 2024. Workers did not get meaningfully richer. They drifted upward through a fixed rate schedule that was designed for a lower-wage economy. Total wage and salary income grew from $53.2 billion in 2002 to $189.9 billion in 2024, with the 2023-to-2024 increase alone worth $14.5 billion.
The household-level picture is worse. In 2024, income tax as a share of total household income stood at 18.8 percent, up from 15.39 percent in 2012, a 3.4 percentage point increase achieved without a single legislative act.
The 2024 fix was a fraction of what was owed
The coalition government’s July 2024 bracket adjustments were the first since 2011 and were marketed as meaningful tax relief. The IRD’s own analysis says otherwise: the cuts reversed only about a third of the fiscal drag accumulated over 14 years. Without them, the mean tax rate would have been 2.55 percentage points higher than in 2010. The government kept the rest as structural revenue.
The gap was enormous. Had brackets been fully indexed, the 30 percent threshold would have started at $66,250, not $48,001. Minimum wage workers on $23.15 an hour, earning just over $48,152 annually, were being taxed at 30 cents in the dollar on income that should have attracted the lowest rate. In 2024, then-Deloitte tax partner Robyn Walker was direct: “You should be on the lowest tax rate, definitely, if you’re on minimum or close to minimum wage.”
The cliff edge employers cannot avoid
In 2023, Deloitte illustrated the bracket boundary problem: someone earning just over $48,000 who received a $1,000 pay rise faced $125 in additional tax from that raise alone, because the marginal rate jumped from 17.5 percent to 30 percent. A 12.5 cent-in-the-dollar wall, not a gradient.
For employers, this creates a perverse dynamic. When after-tax pay is compressed by bracket creep, workers demand higher gross wages to maintain living standards. Businesses bear higher payroll costs for the same net pay outcome. In a cost-heavy economy where firms are already absorbing elevated insurance premiums, council rates, and input costs, the stealth tax on their workforce is an additional drag that never appears on any government invoice.
The structural fix that keeps not arriving
In 2024, Baucher noted there had been only five or six adjustments to tax bands since the late 1980s. Countries like the United Kingdom have solved this by mandating inflation indexation, requiring Parliament to actively vote to override the adjustment. New Zealand has no such mechanism. Deloitte’s 2023 analysis noted that government tax revenue grew from $97.4 billion in 2021 to $107.9 billion in 2022, with bracket creep a contributing factor. That revenue came directly from the spending power of middle-income households.
The 2024 adjustment simply established a new baseline from which creep resumes. Without an indexation commitment, the cycle repeats: freeze, accumulate, correct partially, present the correction as generosity. For business owners watching consumer demand weaken and payroll costs rise, the question is not whether bracket creep happened. It is whether any government will ever give up the quiet revenue stream it provides, or whether the next correction will arrive in another decade, packaged once again as a gift.
Sources
- Newsroom: Tax system’s ‘dirty little secret’ means middle earners pay extra $2b (2026-04-24)
- RNZ: Budget 2024 — Government ‘should commit to more regular tax change’ (2024)
- RNZ: Budget 2024 — Government ‘should commit to more regular tax change’ (Business) (2024)
- Inland Revenue: Wage and salary distributions for individuals (2024-10-04)
- Deloitte NZ: Inflation and personal tax bracket creep — a bigger picture (2023-02)